If you like the raw, unplugged sound of acoustic music, how about amping up the volume of your iPhone with a set of speakers that can also deliver music in the same vein? That’s right, with no electricity needed, the Koostik[2] is a handmade wooden speaker system[3] that forgoes the use of any electronics, instead using its material and form to take the sound of your iPhone to new, energy free heights.

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Koostik resembles the shape of other iPhone docking stations, but unlike its carbon heavy peers, the Koostik has been handmade out a variety of woods by a woodworker named Jim. The wooden speakers work off the same principle of an acoustic guitar[5] – where strumming guitar strings on their own creates a subdued noise, but when placed them over a hollow body the sounds are much more apparent. Koostik follows the same basic principle, using a hollow body device that amplifies the sound coming out of the iPhones internal speaker with no batteries – the only energy being used is from the battery of your iPhone.

Unfortunately, Jim only makes the device for iPhones[6] right now, and since iPods don’t have speakers, it won’t work for them either. However, the Koostiks do come in a variety of woods and colors and all are handmade and unique (no word on if the wood is FSC certified or sustainably harvested). Prices of each system ranges from $85 to $90 depending on what wood you choose.